43642913 has 2 divisors, whose sum is σ = 43642914. Its totient is φ = 43642912.

The previous prime is 43642909. The next prime is 43642933. The reversal of 43642913 is 31924634.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35617024 + 8025889 = 5968^2 + 2833^2 .

It is a cyclic number.

It is not a de Polignac number, because 43642913 - 2² = 43642909 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 43642913.

It is not a weakly prime, because it can be changed into another prime (43642933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21821456 + 21821457.

It is an arithmetic number, because the mean of its divisors is an integer number (21821457).

Almost surely, 2^43642913 is an apocalyptic number.

It is an amenable number.

43642913 is a deficient number, since it is larger than the sum of its proper divisors (1).

43642913 is an equidigital number, since it uses as much as digits as its factorization.

43642913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 32.

The square root of 43642913 is about 6606.2783017369. The cubic root of 43642913 is about 352.0772068290.

The spelling of 43642913 in words is "forty-three million, six hundred forty-two thousand, nine hundred thirteen".